sparse - Create sparse distributed or codistributed matrix

Syntax

Description

SD = sparse(FD) converts a full distributed or codistributed array FD to a sparse distributed or codistributed (respectively) array SD.

SC = sparse(m, n, codist) creates an m-by-n sparse codistributed array of underlying class double, distributed according to the scheme defined by the codistributor codist. For information on constructing codistributor objects, see the reference pages for codistributor1d and codistributor2dbc. This form of the syntax is most useful inside spmd, pmode, or a parallel job.

SC = sparse(m, n, codist, 'noCommunication') creates an m-by-n sparse codistributed array in the manner specified above, but does not perform any global communication for error checking when constructing the array. This form of the syntax is most useful inside spmd, pmode, or a parallel job.

Note   To create a sparse codistributed array of underlying class logical, first create an array of underlying class double and then cast it using the logical function: spmd SC = logical(sparse(m, n, codistributor1d())); end

Examples

With four labs,

spmd(4)
    C = sparse(1000, 1000, codistributor1d())
end

creates a 1000-by-1000 codistributed sparse double array C. C is distributed by its second dimension (columns), and each lab contains a 1000-by-250 local piece of C.

spmd(4)
    codist = codistributor1d(2, 1:numlabs)
    C = sparse(10, 10, codist);
end

creates a 10-by-10 codistributed sparse double array C, distributed by its columns. Each lab contains a 10-by-labindex local piece of C.

Convert a distributed array into a sparse distributed array:

R = distributed.rand(1000);
D = floor(2*R); % D also is distributed
SD = sparse(D); % SD is sparse distributed

See Also

codistributed.spalloc | distributed.spalloc | sparse

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